Thytronic NC020 - Page 25

FUNCTION CHARACTERISTICS
25
NC020 - Manual - 05 - 2022
By means vector addition of direct measures the following are calculated (RMS value of fundamen-
tal components):
• Residual current (RMS value of the fundamental component) I
EC
• Displacement angle of the I
N
neutral current respect the I
L1
phase current: (φ
N
)I
N PHI
• Peak voltages V
1
, V
2
, V
3
IECOMP.ai
(I
n
)
ACQUISITION
i
L1
, i
L2
, i
L3
i
EC
DFT
CT
≈
∑
I
EC
Fase.ai
ϕ
N
= ∠I
N
- ∠I
L1
ϕ
NC
= ϕ
N
- ϕ
C
ϕ
N
(I
N PHI
)
(°
)
ϕ
NC
(Phi
NC
)
(°
)
I
N
I
NC
I
C
I
L1
V1V2V3.ai
(U
n
)
ACQUISITION
i
L1
, i
L2
, i
L3
V
1
, V
2
, V
3
≈
DFT
∑
=
⋅
⋅⋅⋅⋅
=
23
n
n
pk(1...3)
I
C
f
n
V
1
2
1
π